Conitel 2020

The Conitel 2020 protocol was developed by Leeds&Northrup for communication between a SCADA system and RTUs of the same vendor.

Physical layer encoding is based on 32-bit words.

Conitel 2020 operates in half-duplex mode following the master/slave principle. A master can communicate with up to 15 RTUs, an RTU only responds to explicit requests by the master.


7 Application Layer Conitel-2020 Application Layer
6 Presentation Layer n/a
5 Session Layer n/a
4 Transport Layer n/a
3 Network Layer n/a
2 Link Layer n/a
1 Physical Layer PCM, 32 bit
RS232 (V.24)

Supported Information Types

Control Direction
  • Double Command
  • Regulating step command
  • Setpoint [12 bit]
Monitoring Direction
  • Single indication [1 Bit]
  • Measured value [12 bit]
  • Counter value [12 bit]
  • Counter value [24 bit]

Protocol Features

  • Physical Layer

    PCM, half-duplex, 32 bit data words

  • Application Layer

    on-demand transmission of analog and counter values
    on-demand transmission of single point indications with change detection
    "Select before operate" transmission of commands and indications

  • Address Space

    RTU addresses 1..15
    up to 16 groups with up to 16 12-bit-words each

Implemented Protocol Stacks

Conitel-2020, Slave

Applicable Products

  • ipConvLite

    inexpensive protocol converter for standardized application

  • ipConvOPC

    Softwarepackage for conversion between OPC DA 3.0 Server and standard protocols

  • ipConvPBS

    Universal protocol converter with integrated PROFIBUS-DP, slave interface

  • ipConvPBM

    Universal protocol converter with integrated PROFIBUS-DP, master interface

  • ipConvPNM

    Universal protocol converter with integrated PROFINET-IO, master interface

    Available soon !
  • ipConvPNS

    Universal protocol converter with integrated PROFINET-IO, slave interface

  • ipConv

    Universal protocol converter for highest degree of flexibility


  • Project CFE
    Project CFE, Mexico

    Products: ipConv
    Protocol Stacks: Conitel-2020, Slave DNP V3.00, Slave DNP V3.00, Master Harris-5000/6000, Slave Recon, Slave Indactic 33/41, 2033, Slave Fuji, Slave XMAT, Master